Automatic cut-off for gas stoves



July 28 1931- T. PANTELAKls 1,816,791

AUTOMATIC CUT-OFF FOR GAS STOVES Filed Oct. 23, 1929 2 Sheets-Sheei l ATTORNEY July 28, .1931- I* T. PANTELAKls 1,816,791

AUTOHATIC CUT-OFF FOR GAS STOVES Filedoct. 2:5. 192s 2 sheets-sheet 2 INVENTOR WITNESS: ATTORNEY :Patented July. 28, A1931 rreims murmurs, or LOGAN, wies'r merma 'AUTOMATIC cur-ors ron ons srovns application meavoctober es,- ma. serial no. 401x350.

This invention relates to an automatic cutoff for gas stoves and the like, the general object of the invention being to provide thermostatically controlled means for closing a cir- 5 cuit to a motor if the llame of the stove should become extinguished for any reason, with means operated by themotor for closing a valve in the supply line so that the supply of gas to the stove will be cut oli if the flame i should become extinguished.

Another object vof the invention is to provide means for opening the valve by hand and for re-setting the thermostatic means by hand after the parts have operated to close 15 the valve. o

This invention also consists in certain other features of construction and in thecombination and arrangement of the several parts, to be hereinafter fully described, illustrated in au the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or 2e corresponding parts throughout the several views, and in which Figure 1 is a side elevation view showing the invention applied to a gas heater.

Figure 2 is a section on lin'e 2 2 of Figse ure 1.

Figure 3 is a section on line 3 3 of Figure 2. v v

Figure 4 isa section on line 4 4 of Figure Figure 5 is a section on line 5 5 of Figure 4.

Fggure 6 is a section on line 6 6 of Figure Figure 7 is a sectional view showing how the insulated contact carrying plate is fastened to the lever. In these drawings, the letter AV indicates a gas heater of the usual construction, though it will, ofcourse, be understood that the inet ventin can be used with any kind of a gas toi'e or otherappliance which uses gas as a The letterl B indicates a cabinet or-casing through which asses a pipel which has one end connected Ey a tube 2 to the source of the cabinet. lower part of the arm 8 and a bell crank 10 supply and its other end by a tube 3 with the pipe which is connected with the burners of the stove, the usual valve 4 being arranged in the latter pipe for controlling the supply of gas to theburners. A valve 5 is varranged 55 in the pipe 1 within the cabinet and the arm 6 of this valve is connected by a link 7 with an arm 8 which is connected intermediate its ends with the shaft of a motor M arranged in A pin 9 is connected with the 00 is pivotedin the cabinet and has one arm engaging the pin 9 when the parts are in a posi- I tion with the valve 5 open. A strip of insulating material 11 is :fastened to the arm 05 of the bell crank and contacts the pin. The second arm of the bell crank bears against a switch arm 12 when the parts are in a position with the valve 5 open and the bell crank is connected by a conductor 13 with a ter- 7 minal of the lmotor M and the switch arm 12 is connected by a conductor 14 with a terminal of a plug 15 removably arranged in one wall of the cabinet. The other terminal of the motor and the other terminal of the u plu are connected by the conductors 16 with the atteries 17 arranged in the cabinet. If desired, the batteries 17 can be eliminated and the conductors 16 connected to a plug l'18 which in turn is connected with the house 9 current. When the motor operates, the arm 8 will be shifted to the position it occupies in dotted lines in Figure 5, so that the valve 5 will be closed, and as the pin 9 moves away from the bell crank, the same will dro under the action of gravity into its dotte line position in Figure 5, and thearm 12 will' drop against the stop 19 so that the bell crank will b e out of engagement with the arm 12 and thus the circuit to the motor will be broken. The parts can be returned to their normal or full line position in Figure 5 by moving a pin 20 passing through a slot 21 in the top of the cabinet from the dotted line position to its full line position, as the inner end of the pin will engage the upper end of the arm 8 and move said arm from its dotted line position to its full line position. This -pinis carried by a sliding bar 22 operating ,m- 1n the guideways 23 fastened to the top of 1" the cabinet adjacent the-slot 21. As the arm 'finger piece 8 is moved by the motor, said arm will return .the pin toits dotted line position'if said pin chamber to act on the spring'. "An u rightis supported on the top ofthe cham 1r 25 Aand a lever 3l is pivoted adjacent one .end to lever hasja':V de Yending said upright. Said part 32 at is free end which norma ly rests against the top ofthe chamber' 25 and a 33 oi insulating material is conunected with the other end ofthe lever and passes through a slot in the topof thecasing so that by depreming thisr nger piecathe lever will be raised. z

A pair of ngers 34 is pivotfedto the lever 31 and dependtherefrom intojthe'path of. the finger 23. The upper.; fends of these fingers are oiiset as at 35, so that these portions are normally spacedfromthe contacts 36 carried by a plate 37 connected` with the lever, but insulated therefrom-TA contact in the casing 'and a contact 39onthe'p1ate 37 normally rests on this conxtact'38: 'A second contact'llOfis carried by the' casing and this'contact is connected by a conductor 4l with the upright 30. It will be understood that the two contacts are out of. electrical connection, due to the fact that the plate 37 is insulated from the lever an its associated parts, but when either nger .34 is swun to the right in Figure 3, the part .of said it .u ger will engage a contact 36 and thus the contacts 38 and 40 will be electricallyv Y connected together. These contacts 38 and 40 are connected by conductors passing through the iexible tube 42 to the (plug 15. i

It will, of course, he understoo l that the valve 5 is normally open and while the switch, composed of the parts 10 and 12, are in circuit closing position, the circuit is broken by the parts 35 of the fingers 34 being out of engagement with the contacts 36. When the gkas is lighted at the burners of the stove, the eat, actin on the thermostatic device, will cause the nger 28 to move over vthe'usualdial and the ngers 34, these pass fingers simplyv roc ing on their pivots to rmit the finger 28 yto pass them. If the ame should be extinguished for any reason the coolin vof the thermostatic means would cause the ger 28to return to normal position and as said finger passes the firstfinger 34, it will cause the upper end 35 of said finger to vengage its contact 36, lso that the circuit would be closed through the conductors connected with the battery, the contacts,

Supply line,

Larami- Alate 37, contact 36, finger 34, lever 31, uprig t 30, conductor 41 to contact 40 through the other conductor and tube 42, conductor 14,- to the motor, and through conductor 14, switch parts 12 and 10, conductor 13, to the motor and back to the battery by as @d a9, the

conductor 16. 'Thus the motor will start to A operate and move the arm 8 to close the switch 5 and thus cut oi the supply of gas to the burners. As before stated, when the arm 8 is moved, the switch part 10 will move y out of engagement with the art 12 and thus break the circuit.` If the nger 28 should fail to act on the first finger 34 for any reason, then it will act on the second finger 34.-

After the parts have operated, the parts 24 can be re-set by pressing downwardly u on the finger piece 33 and the parts in the ca inet B can be re-set by sliding the pin 2() to a positionl where it will re-set the arm 8 and the parts attached thereto.

While I have shown the cabinet B as separated from the stove and the casing 24 on the top of the stove, it will, of course, be understood that these parts can be built into the stove or otherwise arranged with respect to the stove. f

Thus it will be seen that I have provided simple means for automatically cutting oiit' the supply of gas to a stove if the ame thereof should be extinguished so that danger of asphyxiating persons in a room in which the stove is loc ted, is eliminated.

in lthe casing lt is thought from lhe foregoing descripi d made in the construction vand in the combination and arrangement of the several parts, provided that such changes fall within the yscope of the appended clalms.

What I claim is 1. In combination with a gas stove and its a valve in said line, a motor, an arm connected with the motor shaft, means :Eorconnecting the arm with the valve whereb operation of the arm b the motor will c ose the valve,fa circuit or the motor, a chamber, a thermostatic device therein including a finger, said thermostatic device being acted on-by the heat from the stove, a pivoted finger in the chamber arranged in the path of the first finger, a contact in the chamber engaged by the pivoted finger when the same is moved by the retrograde movenient of the thermostatic finger, means for connecting the pivoted finger and the contact to the circuit-whereby the circuit of the motor will be closed when the pivoted finger is in Aenga ement with the contact, av gravity switch in the circuit and means for normally holding the same in closed position by the arm on the motor shaft when the arm is Vin a position with the valve open, said arm permittingthe switch to drop to open posiinsegni "fion when ehe nem is moveil by line i close the valvea S ln combination "with e M sie and its supply line, a valve ne, e o'o'oz, en arm cennec'tecl tv t' the mobo? semi,

ineens eonnecing "elle ille valve ivheiehy enemtion ef he nien by melon will close #ne vals 1 einem@ 'ier ghe inooz, e chamber, n ihezinosnie fleviee ther n including e iinger, seid hemnosn'tie device heing nel'eil on by the heet from the sieve, e pivoicl 'linger in lle Chemises efaned in the pelli of the lire-t nger, n Contact in `ille chamber engngecl by ihe pivoecl finger `-when.

the seine is moved by the retrograde nievemen of the theimosteic .fingen means for connecting the pivoed linger and the eonmct to lie cii'cuilJ whereby the circuit of the motor will be closed when 4the pivoted finger is in engagement with the Contact, e gravity switch in the circuit, means for normally holding the same in closed posiion Aby the arm on the motor shaft when the arm is in e position with the lvalve open, said arm permitting the switch to drop to open position when the arm is moved by the motor to close the valve, a linger piece for moving the arm to valve opening position and manuali operated means for moving the pivoted finger out of the path ofthe thermostat-,ic finger.

3. In combination with a gas stove and its supply line, a valve in said line', a motor for moving the valve to closed position, a circuit for the motor, a casing associated with ehe stove. a thermostat in the casing and acted on by the heat from the stove, sald thermostat including a finger, a lever pivoted in the casing, a finger pivoted to 'the levei and depending into the path of the eherniestetic Enger, the upper end of the nivel-ed linger being` oset, e, plate eaiied; by the lever and insulated therefrom9 e conteel: ceiried by said plate :and engngeel by the ese; past of 'the linger when 'the seme is moved by erograde movement the -heznossatic finger, means for eonneciing che eontact anni the levez1 with the cieni whereby yehe cieni: will he closed when the offset peet of the pivoecl finger engages the coneet, e ,inffei piece on fhc lever and exencling 'f'efei the easing. whereby ihe lever loe 'JCL o move. its pivo'tefi linger above the me* moste'ie linger and e seeencl switch in the ein cuitv moved to open gesiion the acts to elese lie valve in 'esimeny when' if. 

